The vc4_irq_disable(), among other things, will call disable_irq() to complete any in-flight interrupts.
This requires its counterpart, vc4_irq_enable(), to call enable_irq() which causes issues addressed in a later patch.
However, vc4_irq_disable() is called by two callees: vc4_irq_uninstall() and vc4_v3d_runtime_suspend().
vc4_irq_uninstall() also calls free_irq() which already disables the interrupt line. We thus don't require an explicit disable_irq() for that call site.
vc4_v3d_runtime_suspend() doesn't have any other code. However, the rest of vc4_irq_disable() masks the interrupts coming from the v3d, so explictly disabling the interrupt line is also redundant.
The only thing we really care about is thus to make sure we don't have any handler in-flight, as suggested by the comment. We can thus replace disable_irq() by synchronize_irq().
Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_irq.c | 2 +- drivers/gpu/drm/vc4/vc4_v3d.c | 2 -- 2 files changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_irq.c b/drivers/gpu/drm/vc4/vc4_irq.c index 2eacfb6773d2..a9fc63d9a7f0 100644 --- a/drivers/gpu/drm/vc4/vc4_irq.c +++ b/drivers/gpu/drm/vc4/vc4_irq.c @@ -295,7 +295,7 @@ vc4_irq_disable(struct drm_device *dev) V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
/* Finish any interrupt handler still in flight. */ - disable_irq(vc4->irq); + synchronize_irq(vc4->irq);
cancel_work_sync(&vc4->overflow_mem_work); } diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c index e7990bed0a96..a2da0db73a5c 100644 --- a/drivers/gpu/drm/vc4/vc4_v3d.c +++ b/drivers/gpu/drm/vc4/vc4_v3d.c @@ -393,8 +393,6 @@ static int vc4_v3d_runtime_resume(struct device *dev)
vc4_v3d_init_hw(&vc4->base);
- /* We disabled the IRQ as part of vc4_irq_uninstall in suspend. */ - enable_irq(vc4->irq); vc4_irq_enable(&vc4->base);
return 0;